Publications

@article{Yao2025-ht,

title = {Optoacoustic lenses for lateral sub-optical resolution  elasticity imaging},

author = {Mengting Yao and Rafael Fuentes-Dom\'{i}nguez and Salvatore La 3rd Cavera and Fernando P\'{e}rez-Cota and Richard J Smith and Matt Clark},

doi = {10.1016/j.pacs.2024.100663},

year  = {2025},

date = {2025-02-01},

urldate = {2025-02-01},

journal = {Photoacoustics},

volume = {41},

number = {100663},

pages = {100663},

publisher = {Elsevier BV},

abstract = {In this paper, we demonstrate for the first time the focusing of 

 gigahertz coherent phonon pulses propagating in water using 

 picosecond ultrasonics and Brillouin light scattering. We 

 achieve this by using planar Fresnel zone plate and concave 

 lenses with different focal lengths. Pump light illuminating the 

 optoacoustic lens generates a focusing acoustic field, and 

 Brillouin scattered probe light allows the acoustic field to be 

 continuously monitored over time. Agreement of the experiment 

 with a numerical model suggests that we can generate a focused 

 acoustic beam down to ∼ 250 nm. A clear focusing effect is 

 observed experimentally as a modulation of the envelope of the 

 time-resolved Brillouin scattering (TRBS) signal. These findings 

 are a crucial step toward their application in high-resolution 

 acoustic microscopy. This work experimentally demonstrates a 

 method to narrow the lateral size of picosecond laser-generated 

 phonon fields in an aqueous environment, making it well-suited 

 for 3D imaging applications in biological systems using TRBS.},

keywords = {78A60, 92C55, Brillouin scattering, Elasticity imaging, Phonon   focusing, Picosecond laser ultrasonics},

pubstate = {published},

tppubtype = {article}

}